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<a href="_open_c_l_2_pooling_8h.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno">    1</span><span class="preprocessor">#ifndef SHARK_CORE_IMAGES_OPENCL_POOLING_H</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno">    2</span><span class="preprocessor">#define SHARK_CORE_IMAGES_OPENCL_POOLING_H</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno">    3</span> </div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno">    4</span><span class="preprocessor">#include &lt;<a class="code" href="_base_8h.html">shark/LinAlg/Base.h</a>&gt;</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno">    5</span><span class="preprocessor">#include &lt;<a class="code" href="_exception_8h.html">shark/Core/Exception.h</a>&gt;</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno">    6</span><span class="preprocessor">#include &lt;<a class="code" href="_shape_8h.html">shark/Core/Shape.h</a>&gt;</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno">    7</span><span class="keyword">namespace </span><a class="code hl_namespace" href="namespaceshark.html" title="AbstractMultiObjectiveOptimizer.">shark</a>{</div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno">    8</span><span class="keyword">namespace </span>image{</div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno">    9</span><span class="keyword">template</span>&lt;<span class="keyword">class</span> T&gt;</div>
<div class="foldopen" id="foldopen00010" data-start="{" data-end="}">
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno"><a class="line" href="namespaceshark_1_1image.html#a4f5d170e99508b9324d70e413b84b74f">   10</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="namespaceshark_1_1image.html#a4575c29d1700b08ba700892f506c2491">maxPooling</a>(</div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno">   11</span>    blas::dense_matrix_adaptor&lt;T const, blas::row_major, blas::continuous_dense_tag, blas::gpu_tag&gt; inputs_unreg, </div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno">   12</span>    <a class="code hl_class" href="classshark_1_1_shape.html" title="Represents the Shape of an input or output.">Shape</a> <span class="keyword">const</span>&amp; shape,</div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno">   13</span>    <a class="code hl_class" href="classshark_1_1_shape.html" title="Represents the Shape of an input or output.">Shape</a> <span class="keyword">const</span>&amp; patchSize,</div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno">   14</span>    blas::dense_matrix_adaptor&lt;T, blas::row_major, blas::continuous_dense_tag, blas::gpu_tag&gt; outputs_unreg</div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno">   15</span>){</div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno">   16</span>    </div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno">   17</span>    std::size_t depth = shape[2];</div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno">   18</span>    std::size_t outputHeight = shape[0]/patchSize[0];</div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno">   19</span>    std::size_t outputWidth = shape[1]/patchSize[1];</div>
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno">   20</span>    std::size_t outputPixels = outputWidth * outputHeight;</div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno">   21</span>    <a class="code hl_define" href="_exception_8h.html#a42a6a50e4d06c00d60fbca5333f40768">SIZE_CHECK</a>(inputs_unreg.size2() == shape[0] * shape[1] * depth);</div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno">   22</span>    <a class="code hl_define" href="_exception_8h.html#a42a6a50e4d06c00d60fbca5333f40768">SIZE_CHECK</a>(outputs_unreg.size2() == outputPixels * depth);</div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno">   23</span>    <a class="code hl_define" href="_exception_8h.html#a42a6a50e4d06c00d60fbca5333f40768">SIZE_CHECK</a>(outputs_unreg.size1() == inputs_unreg.size1());</div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno">   24</span> </div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno">   25</span>    blas::gpu::detail::meta_kernel k(<span class="stringliteral">&quot;shark_max_pooling&quot;</span>);</div>
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno">   26</span>    std::size_t width_index = k.add_arg&lt;std::size_t&gt;(<span class="stringliteral">&quot;width&quot;</span>);</div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno">   27</span>    std::size_t height_index = k.add_arg&lt;std::size_t&gt;(<span class="stringliteral">&quot;height&quot;</span>);</div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno">   28</span>    std::size_t depth_index = k.add_arg&lt;std::size_t&gt;(<span class="stringliteral">&quot;depth&quot;</span>);</div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno">   29</span>    std::size_t sizeH_index = k.add_arg&lt;std::size_t&gt;(<span class="stringliteral">&quot;sizeH&quot;</span>);</div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno">   30</span>    std::size_t sizeW_index = k.add_arg&lt;std::size_t&gt;(<span class="stringliteral">&quot;sizeW&quot;</span>);</div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno">   31</span>    std::size_t numImages_index = k.add_arg&lt;std::size_t&gt;(<span class="stringliteral">&quot;numImages&quot;</span>);</div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno">   32</span>    <span class="keyword">auto</span> inputs = k.register_args(to_functor(inputs_unreg));</div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno">   33</span>    <span class="keyword">auto</span> outputs = k.register_args(to_functor(outputs_unreg));</div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno">   34</span> </div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno">   35</span>    k &lt;&lt; <span class="stringliteral">&quot;const ulong outputWidth = width / sizeW;\n&quot;</span>;</div>
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno">   36</span>    k &lt;&lt; <span class="stringliteral">&quot;const ulong outputHeight = height / sizeH;\n&quot;</span>;</div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno">   37</span>    k &lt;&lt; <span class="stringliteral">&quot;const ulong numOutputs = outputWidth * outputHeight;\n&quot;</span>;</div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno">   38</span>    k &lt;&lt; <span class="stringliteral">&quot;const ulong id = get_global_id(0);\n&quot;</span>;</div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno">   39</span>    k &lt;&lt; <span class="stringliteral">&quot;if(id &gt;= numImages * numOutputs) return;\n&quot;</span>; <span class="comment">//bounds checking for groups</span></div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno">   40</span>    </div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno">   41</span>    k &lt;&lt; <span class="stringliteral">&quot;const ulong im = id / numOutputs;\n&quot;</span>;<span class="comment">//extract image id</span></div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno">   42</span>    k &lt;&lt; <span class="stringliteral">&quot;const ulong p = id % numOutputs;\n&quot;</span>;<span class="comment">//extract patch id</span></div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno">   43</span>    </div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno">   44</span>    <span class="comment">//get start and end-coordinates of the patch</span></div>
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno">   45</span>    k &lt;&lt; <span class="stringliteral">&quot;const ulong starti = (p / outputWidth) * sizeH;\n&quot;</span>;</div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno">   46</span>    k &lt;&lt; <span class="stringliteral">&quot;const ulong startj = (p % outputWidth) * sizeW;\n&quot;</span>;</div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno">   47</span>    k &lt;&lt; <span class="stringliteral">&quot;const ulong endi = starti + sizeH;\n&quot;</span>;</div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno">   48</span>    k &lt;&lt; <span class="stringliteral">&quot;const ulong endj = startj + sizeW;\n&quot;</span>;</div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno">   49</span>    k &lt;&lt; <span class="stringliteral">&quot;for(ulong c = get_local_id(1); c &lt; depth; c += get_local_size(1)){\n&quot;</span>;</div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno">   50</span>    k &lt;&lt; <span class="stringliteral">&quot;  ulong index = (starti * width + startj) * depth +c;\n&quot;</span>;</div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno">   51</span>    <span class="keyword">auto</span> im = k.expr&lt;cl_ulong&gt;(<span class="stringliteral">&quot;im&quot;</span>);</div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno">   52</span>    <span class="keyword">auto</span> index = k.expr&lt;cl_ulong&gt;(<span class="stringliteral">&quot;index&quot;</span>);</div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno">   53</span>        <span class="comment">//traverse the patch on the input image and compute maximum</span></div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno">   54</span>    k &lt;&lt; <span class="stringliteral">&quot;  &quot;</span> &lt;&lt; k.decl&lt;T&gt;(<span class="stringliteral">&quot;val&quot;</span>) &lt;&lt;<span class="stringliteral">&quot; = &quot;</span>&lt;&lt; inputs(im, index) &lt;&lt; <span class="stringliteral">&quot;;\n&quot;</span>;</div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno">   55</span>    k &lt;&lt; <span class="stringliteral">&quot;  for(ulong i = starti; i != endi; ++i){\n&quot;</span>;</div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno">   56</span>    k &lt;&lt; <span class="stringliteral">&quot;      for(ulong j = startj; j != endj; ++j){\n&quot;</span>;</div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno">   57</span>    k &lt;&lt; <span class="stringliteral">&quot;          index =  (i * width + j) * depth + c;\n&quot;</span>;</div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno">   58</span>    k &lt;&lt; <span class="stringliteral">&quot;          val = max(val,&quot;</span>&lt;&lt;inputs(im, index)&lt;&lt;<span class="stringliteral">&quot;);\n&quot;</span>;</div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno">   59</span>    k &lt;&lt; <span class="stringliteral">&quot;      }\n&quot;</span>;</div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno">   60</span>    k &lt;&lt; <span class="stringliteral">&quot;  }\n&quot;</span>;</div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno">   61</span>    k &lt;&lt; <span class="stringliteral">&quot;  &quot;</span> &lt;&lt; outputs(im, k.expr&lt;cl_ulong&gt;(<span class="stringliteral">&quot;(p * depth + c)&quot;</span>))&lt;&lt;<span class="stringliteral">&quot; = val;\n&quot;</span>;</div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno">   62</span>    k &lt;&lt; <span class="stringliteral">&quot;}\n&quot;</span>;</div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno">   63</span>    </div>
<div class="line"><a id="l00064" name="l00064"></a><span class="lineno">   64</span>    <span class="comment">//compile kernel</span></div>
<div class="line"><a id="l00065" name="l00065"></a><span class="lineno">   65</span>    boost::compute::kernel kernel = k.compile(outputs_unreg.queue().get_context());</div>
<div class="line"><a id="l00066" name="l00066"></a><span class="lineno">   66</span>    </div>
<div class="line"><a id="l00067" name="l00067"></a><span class="lineno">   67</span>    <span class="comment">//enqueue kernel with kernel args</span></div>
<div class="line"><a id="l00068" name="l00068"></a><span class="lineno">   68</span>    kernel.set_arg(height_index, shape[0]);</div>
<div class="line"><a id="l00069" name="l00069"></a><span class="lineno">   69</span>    kernel.set_arg(width_index, shape[1]);</div>
<div class="line"><a id="l00070" name="l00070"></a><span class="lineno">   70</span>    kernel.set_arg(depth_index, shape[2]);</div>
<div class="line"><a id="l00071" name="l00071"></a><span class="lineno">   71</span>    kernel.set_arg(sizeH_index, patchSize[0]);</div>
<div class="line"><a id="l00072" name="l00072"></a><span class="lineno">   72</span>    kernel.set_arg(sizeW_index, patchSize[1]);</div>
<div class="line"><a id="l00073" name="l00073"></a><span class="lineno">   73</span>    kernel.set_arg(numImages_index, inputs_unreg.size1());</div>
<div class="line"><a id="l00074" name="l00074"></a><span class="lineno">   74</span>    </div>
<div class="line"><a id="l00075" name="l00075"></a><span class="lineno">   75</span>    </div>
<div class="line"><a id="l00076" name="l00076"></a><span class="lineno">   76</span>    std::size_t local_work_size[2] = {8, 4};</div>
<div class="line"><a id="l00077" name="l00077"></a><span class="lineno">   77</span>    <span class="comment">//round global work size up to next multiple of local work size</span></div>
<div class="line"><a id="l00078" name="l00078"></a><span class="lineno">   78</span>    std::size_t global_work_size[2] = {</div>
<div class="line"><a id="l00079" name="l00079"></a><span class="lineno">   79</span>        ((inputs_unreg.size1() * outputPixels + local_work_size[0] - 1) / local_work_size[0]) * local_work_size[0] , </div>
<div class="line"><a id="l00080" name="l00080"></a><span class="lineno">   80</span>        ((depth + local_work_size[1] - 1) / local_work_size[1]) * local_work_size[1] </div>
<div class="line"><a id="l00081" name="l00081"></a><span class="lineno">   81</span>    };</div>
<div class="line"><a id="l00082" name="l00082"></a><span class="lineno">   82</span>    outputs_unreg.queue().enqueue_nd_range_kernel(kernel, 2, <span class="keyword">nullptr</span>, global_work_size, local_work_size);</div>
<div class="line"><a id="l00083" name="l00083"></a><span class="lineno">   83</span>}</div>
</div>
<div class="line"><a id="l00084" name="l00084"></a><span class="lineno">   84</span> </div>
<div class="line"><a id="l00085" name="l00085"></a><span class="lineno">   85</span><span class="keyword">template</span>&lt;<span class="keyword">class</span> T&gt;</div>
<div class="foldopen" id="foldopen00086" data-start="{" data-end="}">
<div class="line"><a id="l00086" name="l00086"></a><span class="lineno"><a class="line" href="namespaceshark_1_1image.html#afd9168c1763234d661efddb39c50a6f3">   86</a></span><span class="keywordtype">void</span> <a class="code hl_function" href="namespaceshark_1_1image.html#ad16d75e2efb8418fd83408f8fa922d47">maxPoolingDerivative</a>(</div>
<div class="line"><a id="l00087" name="l00087"></a><span class="lineno">   87</span>    blas::dense_matrix_adaptor&lt;T const, blas::row_major, blas::continuous_dense_tag, blas::gpu_tag&gt; inputs_unreg, </div>
<div class="line"><a id="l00088" name="l00088"></a><span class="lineno">   88</span>    blas::dense_matrix_adaptor&lt;T const, blas::row_major, blas::continuous_dense_tag, blas::gpu_tag&gt; coefficients_unreg, </div>
<div class="line"><a id="l00089" name="l00089"></a><span class="lineno">   89</span>    <a class="code hl_class" href="classshark_1_1_shape.html" title="Represents the Shape of an input or output.">Shape</a> <span class="keyword">const</span>&amp; shape,</div>
<div class="line"><a id="l00090" name="l00090"></a><span class="lineno">   90</span>    <a class="code hl_class" href="classshark_1_1_shape.html" title="Represents the Shape of an input or output.">Shape</a> <span class="keyword">const</span>&amp; patchSize,</div>
<div class="line"><a id="l00091" name="l00091"></a><span class="lineno">   91</span>    blas::dense_matrix_adaptor&lt;T, blas::row_major, blas::continuous_dense_tag, blas::gpu_tag&gt; derivatives_unreg</div>
<div class="line"><a id="l00092" name="l00092"></a><span class="lineno">   92</span>){</div>
<div class="line"><a id="l00093" name="l00093"></a><span class="lineno">   93</span>    derivatives_unreg.clear();</div>
<div class="line"><a id="l00094" name="l00094"></a><span class="lineno">   94</span>    std::size_t depth = shape[2];</div>
<div class="line"><a id="l00095" name="l00095"></a><span class="lineno">   95</span>    std::size_t outputHeight = shape[0]/patchSize[0];</div>
<div class="line"><a id="l00096" name="l00096"></a><span class="lineno">   96</span>    std::size_t outputWidth = shape[1]/patchSize[1];</div>
<div class="line"><a id="l00097" name="l00097"></a><span class="lineno">   97</span>    std::size_t outputPixels = outputWidth * outputHeight;</div>
<div class="line"><a id="l00098" name="l00098"></a><span class="lineno">   98</span>    <a class="code hl_define" href="_exception_8h.html#a42a6a50e4d06c00d60fbca5333f40768">SIZE_CHECK</a>(derivatives_unreg.size2() == shape[0] * shape[1] * depth);</div>
<div class="line"><a id="l00099" name="l00099"></a><span class="lineno">   99</span>    <a class="code hl_define" href="_exception_8h.html#a42a6a50e4d06c00d60fbca5333f40768">SIZE_CHECK</a>(inputs_unreg.size2() == shape[0] * shape[1] * depth);</div>
<div class="line"><a id="l00100" name="l00100"></a><span class="lineno">  100</span>    <a class="code hl_define" href="_exception_8h.html#a42a6a50e4d06c00d60fbca5333f40768">SIZE_CHECK</a>(coefficients_unreg.size2() == outputPixels * depth);</div>
<div class="line"><a id="l00101" name="l00101"></a><span class="lineno">  101</span>    <a class="code hl_define" href="_exception_8h.html#a42a6a50e4d06c00d60fbca5333f40768">SIZE_CHECK</a>(derivatives_unreg.size1() == inputs_unreg.size1());</div>
<div class="line"><a id="l00102" name="l00102"></a><span class="lineno">  102</span>    <a class="code hl_define" href="_exception_8h.html#a42a6a50e4d06c00d60fbca5333f40768">SIZE_CHECK</a>(derivatives_unreg.size1() == coefficients_unreg.size1());</div>
<div class="line"><a id="l00103" name="l00103"></a><span class="lineno">  103</span> </div>
<div class="line"><a id="l00104" name="l00104"></a><span class="lineno">  104</span>    blas::gpu::detail::meta_kernel k(<span class="stringliteral">&quot;shark_max_pooling_derivative&quot;</span>);</div>
<div class="line"><a id="l00105" name="l00105"></a><span class="lineno">  105</span>    std::size_t width_index = k.add_arg&lt;std::size_t&gt;(<span class="stringliteral">&quot;width&quot;</span>);</div>
<div class="line"><a id="l00106" name="l00106"></a><span class="lineno">  106</span>    std::size_t height_index = k.add_arg&lt;std::size_t&gt;(<span class="stringliteral">&quot;height&quot;</span>);</div>
<div class="line"><a id="l00107" name="l00107"></a><span class="lineno">  107</span>    std::size_t depth_index = k.add_arg&lt;std::size_t&gt;(<span class="stringliteral">&quot;depth&quot;</span>);</div>
<div class="line"><a id="l00108" name="l00108"></a><span class="lineno">  108</span>    std::size_t sizeH_index = k.add_arg&lt;std::size_t&gt;(<span class="stringliteral">&quot;sizeH&quot;</span>);</div>
<div class="line"><a id="l00109" name="l00109"></a><span class="lineno">  109</span>    std::size_t sizeW_index = k.add_arg&lt;std::size_t&gt;(<span class="stringliteral">&quot;sizeW&quot;</span>);</div>
<div class="line"><a id="l00110" name="l00110"></a><span class="lineno">  110</span>    std::size_t numImages_index = k.add_arg&lt;std::size_t&gt;(<span class="stringliteral">&quot;numImages&quot;</span>);</div>
<div class="line"><a id="l00111" name="l00111"></a><span class="lineno">  111</span>    <span class="keyword">auto</span> inputs = k.register_args(to_functor(inputs_unreg));</div>
<div class="line"><a id="l00112" name="l00112"></a><span class="lineno">  112</span>    <span class="keyword">auto</span> coefficients = k.register_args(to_functor(coefficients_unreg));</div>
<div class="line"><a id="l00113" name="l00113"></a><span class="lineno">  113</span>    <span class="keyword">auto</span> derivatives = k.register_args(to_functor(derivatives_unreg));</div>
<div class="line"><a id="l00114" name="l00114"></a><span class="lineno">  114</span> </div>
<div class="line"><a id="l00115" name="l00115"></a><span class="lineno">  115</span>    k &lt;&lt; <span class="stringliteral">&quot;const ulong outputWidth = width / sizeW;\n&quot;</span>;</div>
<div class="line"><a id="l00116" name="l00116"></a><span class="lineno">  116</span>    k &lt;&lt; <span class="stringliteral">&quot;const ulong outputHeight = height / sizeH;\n&quot;</span>;</div>
<div class="line"><a id="l00117" name="l00117"></a><span class="lineno">  117</span>    k &lt;&lt; <span class="stringliteral">&quot;const ulong numOutputs = outputWidth * outputHeight;\n&quot;</span>;</div>
<div class="line"><a id="l00118" name="l00118"></a><span class="lineno">  118</span>    k &lt;&lt; <span class="stringliteral">&quot;const ulong id = get_global_id(0);\n&quot;</span>;</div>
<div class="line"><a id="l00119" name="l00119"></a><span class="lineno">  119</span>    k &lt;&lt; <span class="stringliteral">&quot;if(id &gt;= numImages * numOutputs) return;\n&quot;</span>; <span class="comment">//bounds checking for groups</span></div>
<div class="line"><a id="l00120" name="l00120"></a><span class="lineno">  120</span>    </div>
<div class="line"><a id="l00121" name="l00121"></a><span class="lineno">  121</span>    k &lt;&lt; <span class="stringliteral">&quot;const ulong im = id / numOutputs;\n&quot;</span>;<span class="comment">//extract image id</span></div>
<div class="line"><a id="l00122" name="l00122"></a><span class="lineno">  122</span>    k &lt;&lt; <span class="stringliteral">&quot;const ulong p = id % numOutputs;\n&quot;</span>;<span class="comment">//extract patch id</span></div>
<div class="line"><a id="l00123" name="l00123"></a><span class="lineno">  123</span>    </div>
<div class="line"><a id="l00124" name="l00124"></a><span class="lineno">  124</span>    <span class="comment">//get start and end-coordinates of the patch</span></div>
<div class="line"><a id="l00125" name="l00125"></a><span class="lineno">  125</span>    k &lt;&lt; <span class="stringliteral">&quot;const ulong starti = (p / outputWidth) * sizeH;\n&quot;</span>;</div>
<div class="line"><a id="l00126" name="l00126"></a><span class="lineno">  126</span>    k &lt;&lt; <span class="stringliteral">&quot;const ulong startj = (p % outputWidth) * sizeW;\n&quot;</span>;</div>
<div class="line"><a id="l00127" name="l00127"></a><span class="lineno">  127</span>    k &lt;&lt; <span class="stringliteral">&quot;const ulong endi = starti + sizeH;\n&quot;</span>;</div>
<div class="line"><a id="l00128" name="l00128"></a><span class="lineno">  128</span>    k &lt;&lt; <span class="stringliteral">&quot;const ulong endj = startj + sizeW;\n&quot;</span>;</div>
<div class="line"><a id="l00129" name="l00129"></a><span class="lineno">  129</span>    k &lt;&lt; <span class="stringliteral">&quot;for(ulong c = get_local_id(1); c &lt; depth; c += get_local_size(1)){\n&quot;</span>;</div>
<div class="line"><a id="l00130" name="l00130"></a><span class="lineno">  130</span>    k &lt;&lt; <span class="stringliteral">&quot;  ulong index = (starti * width + startj) * depth +c;\n&quot;</span>;</div>
<div class="line"><a id="l00131" name="l00131"></a><span class="lineno">  131</span>    <span class="keyword">auto</span> im = k.expr&lt;cl_ulong&gt;(<span class="stringliteral">&quot;im&quot;</span>);</div>
<div class="line"><a id="l00132" name="l00132"></a><span class="lineno">  132</span>    <span class="keyword">auto</span> index = k.expr&lt;cl_ulong&gt;(<span class="stringliteral">&quot;index&quot;</span>);</div>
<div class="line"><a id="l00133" name="l00133"></a><span class="lineno">  133</span>        <span class="comment">//traverse the patch on the input image and compute maximum</span></div>
<div class="line"><a id="l00134" name="l00134"></a><span class="lineno">  134</span>    k &lt;&lt; <span class="stringliteral">&quot;  &quot;</span> &lt;&lt; k.decl&lt;T&gt;(<span class="stringliteral">&quot;maxVal&quot;</span>)&lt;&lt;<span class="stringliteral">&quot; = &quot;</span> &lt;&lt;inputs(im, index) &lt;&lt; <span class="stringliteral">&quot;;\n&quot;</span>;</div>
<div class="line"><a id="l00135" name="l00135"></a><span class="lineno">  135</span>    k &lt;&lt; <span class="stringliteral">&quot;  ulong maxIndex = index;\n&quot;</span>;</div>
<div class="line"><a id="l00136" name="l00136"></a><span class="lineno">  136</span>    k &lt;&lt; <span class="stringliteral">&quot;  for(ulong i = starti; i != endi; ++i){\n&quot;</span>;</div>
<div class="line"><a id="l00137" name="l00137"></a><span class="lineno">  137</span>    k &lt;&lt; <span class="stringliteral">&quot;      for(ulong j = startj; j != endj; ++j){\n&quot;</span>;</div>
<div class="line"><a id="l00138" name="l00138"></a><span class="lineno">  138</span>    k &lt;&lt; <span class="stringliteral">&quot;          index =  (i * width + j) * depth + c;\n&quot;</span>;</div>
<div class="line"><a id="l00139" name="l00139"></a><span class="lineno">  139</span>    k &lt;&lt; <span class="stringliteral">&quot;          if(&quot;</span>&lt;&lt;inputs(im, index)&lt;&lt;<span class="stringliteral">&quot; &gt; maxVal){\n&quot;</span>;</div>
<div class="line"><a id="l00140" name="l00140"></a><span class="lineno">  140</span>    k &lt;&lt; <span class="stringliteral">&quot;              maxVal = &quot;</span>&lt;&lt;inputs(im, index)&lt;&lt;<span class="stringliteral">&quot;;\n&quot;</span>;</div>
<div class="line"><a id="l00141" name="l00141"></a><span class="lineno">  141</span>    k &lt;&lt; <span class="stringliteral">&quot;              maxIndex = index;\n&quot;</span>;</div>
<div class="line"><a id="l00142" name="l00142"></a><span class="lineno">  142</span>    k &lt;&lt; <span class="stringliteral">&quot;          }\n&quot;</span>;</div>
<div class="line"><a id="l00143" name="l00143"></a><span class="lineno">  143</span>    k &lt;&lt; <span class="stringliteral">&quot;      }\n&quot;</span>;</div>
<div class="line"><a id="l00144" name="l00144"></a><span class="lineno">  144</span>    k &lt;&lt; <span class="stringliteral">&quot;  }\n&quot;</span>;</div>
<div class="line"><a id="l00145" name="l00145"></a><span class="lineno">  145</span>    k &lt;&lt; <span class="stringliteral">&quot;  &quot;</span> &lt;&lt; derivatives(im, k.expr&lt;cl_ulong&gt;(<span class="stringliteral">&quot;maxIndex&quot;</span>)) &lt;&lt; <span class="stringliteral">&quot; = &quot;</span> &lt;&lt; coefficients(im,k.expr&lt;cl_ulong&gt;(<span class="stringliteral">&quot;(p * depth +c)&quot;</span>)) &lt;&lt; <span class="stringliteral">&quot;;\n&quot;</span>;</div>
<div class="line"><a id="l00146" name="l00146"></a><span class="lineno">  146</span>    k &lt;&lt; <span class="stringliteral">&quot;}\n&quot;</span>;</div>
<div class="line"><a id="l00147" name="l00147"></a><span class="lineno">  147</span>    </div>
<div class="line"><a id="l00148" name="l00148"></a><span class="lineno">  148</span>    <span class="comment">//compile kernel</span></div>
<div class="line"><a id="l00149" name="l00149"></a><span class="lineno">  149</span>    boost::compute::kernel kernel = k.compile(derivatives_unreg.queue().get_context());</div>
<div class="line"><a id="l00150" name="l00150"></a><span class="lineno">  150</span>    </div>
<div class="line"><a id="l00151" name="l00151"></a><span class="lineno">  151</span>    <span class="comment">//enqueue kernel with kernel args</span></div>
<div class="line"><a id="l00152" name="l00152"></a><span class="lineno">  152</span>    kernel.set_arg(height_index, shape[0]);</div>
<div class="line"><a id="l00153" name="l00153"></a><span class="lineno">  153</span>    kernel.set_arg(width_index, shape[1]);</div>
<div class="line"><a id="l00154" name="l00154"></a><span class="lineno">  154</span>    kernel.set_arg(depth_index, shape[2]);</div>
<div class="line"><a id="l00155" name="l00155"></a><span class="lineno">  155</span>    kernel.set_arg(sizeH_index, patchSize[0]);</div>
<div class="line"><a id="l00156" name="l00156"></a><span class="lineno">  156</span>    kernel.set_arg(sizeW_index, patchSize[1]);</div>
<div class="line"><a id="l00157" name="l00157"></a><span class="lineno">  157</span>    kernel.set_arg(numImages_index, inputs_unreg.size1());</div>
<div class="line"><a id="l00158" name="l00158"></a><span class="lineno">  158</span>    </div>
<div class="line"><a id="l00159" name="l00159"></a><span class="lineno">  159</span>    </div>
<div class="line"><a id="l00160" name="l00160"></a><span class="lineno">  160</span>    std::size_t local_work_size[2] = {8, 4};</div>
<div class="line"><a id="l00161" name="l00161"></a><span class="lineno">  161</span>    <span class="comment">//round global work size up to next multiple of local work size</span></div>
<div class="line"><a id="l00162" name="l00162"></a><span class="lineno">  162</span>    std::size_t global_work_size[2] = {</div>
<div class="line"><a id="l00163" name="l00163"></a><span class="lineno">  163</span>        ((inputs_unreg.size1() * outputPixels + local_work_size[0] - 1) / local_work_size[0]) * local_work_size[0] , </div>
<div class="line"><a id="l00164" name="l00164"></a><span class="lineno">  164</span>        ((depth + local_work_size[1] - 1) / local_work_size[1]) * local_work_size[1]</div>
<div class="line"><a id="l00165" name="l00165"></a><span class="lineno">  165</span>    };</div>
<div class="line"><a id="l00166" name="l00166"></a><span class="lineno">  166</span>    derivatives_unreg.queue().enqueue_nd_range_kernel(kernel, 2, <span class="keyword">nullptr</span>, global_work_size, local_work_size);</div>
<div class="line"><a id="l00167" name="l00167"></a><span class="lineno">  167</span>}</div>
</div>
<div class="line"><a id="l00168" name="l00168"></a><span class="lineno">  168</span> </div>
<div class="line"><a id="l00169" name="l00169"></a><span class="lineno">  169</span> </div>
<div class="line"><a id="l00170" name="l00170"></a><span class="lineno">  170</span>}}</div>
<div class="line"><a id="l00171" name="l00171"></a><span class="lineno">  171</span> </div>
<div class="line"><a id="l00172" name="l00172"></a><span class="lineno">  172</span><span class="preprocessor">#endif</span></div>
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